There is no problem with bringing snacks or meals onto your flight. There is no problem with carrying on coffee, water, soda, and other "liquids and gels."
It's perfectly okay to bring food from home, as long as the food items don't violate the TSA's security checkpoint rules.
For example, you could bring sandwiches, packaged snacks, and fruit from home. Then you could buy beverages in the airport terminal.
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